<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <!-- 左侧区域 -->
      <div class="logo_text">
        <img src="../assets/heima.png" alt="" title="电商后台管理系统" />
        <span>电商后台管理系统</span>
      </div>
      <!-- 右侧退出区域 -->
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠按钮区域 -->
        <div class="toggle_button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标区域 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本区域 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单的区域 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标区域 -->
                <i class="el-icon-menu"></i>
                <!-- 文本区域 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 左侧菜单图标数据
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao',
      },
      // 按钮是否折叠默认为false
      isCollapse: false,
      // 被激活链接的地址,默认为空地址
      activePath:''
    }
  },
  // 定义一个生命周期函数
  created() {
    // 调用菜单列表方法 getMenuList()
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      //  清空token
      window.sessionStorage.clear()
      //    退出登录成功之后的提示框
      this.$message.success('已退出登录！')
      //   3500毫秒之后跳转到登录页
      setTimeout(() => {
        this.$router.push('/login')
      }, 3500)
    },
    // 获取所有菜单列表
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      // console.log(res)
    },
    // 点击按钮切换菜单的折叠与展开的方法
    toggleCollapse() {
      // console.log('is ok');
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态的方法
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath
    }
  }
}
</script>

<style>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  background-color: #373d41;
  padding-left: 0;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
}
.el-header .logo_text {
  display: flex;
  align-items: center;
}
.el-header .logo_text span {
  margin-left: 15px;
}
.el-aside {
  background-color: #333744;
}
.el-aside .el-menu {
  border-right: none;
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
  font-size: 18px !important;
}
.toggle_button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  color: #ffffff;
  cursor: pointer;
}
</style>
